[reference - do not submit] Always create four pools in TaskSchedulerImpl.

content/public/browser/content_browser_client.h

Index: content/public/browser/content_browser_client.h
diff --git a/content/public/browser/content_browser_client.h b/content/public/browser/content_browser_client.h
index 45056271e932b9d16b6688343186fa795018367e..be188359cbfbbe13317d824fec2a43d722b90b71 100644
--- a/content/public/browser/content_browser_client.h
+++ b/content/public/browser/content_browser_client.h
@@ -50,7 +50,6 @@ class GURL;
 namespace base {
 class CommandLine;
 class FilePath;
-class SchedulerWorkerPoolParams;
 }
 
 namespace gfx {
@@ -813,12 +812,10 @@ class CONTENT_EXPORT ContentBrowserClient {
   // Returns the RapporService from the browser process.
   virtual ::rappor::RapporService* GetRapporService();
 
-  // Provides parameters for initializing the global task scheduler. If
-  // |params_vector| is empty, default parameters are used.
-  virtual void GetTaskSchedulerInitializationParams(
-      std::vector<base::SchedulerWorkerPoolParams>* params_vector,
-      base::TaskScheduler::WorkerPoolIndexForTraitsCallback*
-          index_to_traits_callback) {}
+  // Provides parameters for initializing the global task scheduler. Default
+  // params are used if this returns nullptr.
+  virtual std::unique_ptr<base::TaskSchedulerInitParams>
+  GetTaskSchedulerInitParams();
 
   // Performs any necessary PostTask API redirection to the task scheduler.
   virtual void PerformExperimentalTaskSchedulerRedirections() {}